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Title: Strain-induced dimensionality crossover of precursor modulations in Ni2MnGa

Abstract

Precursor modulations often occur in functional materials like magnetic shape memory alloys, ferroelectrics, and superconductors. In this letter, we have revealed the underlying mechanism of the precursor modulations in ferromagnetic shape memory alloys Ni2MnGa by combining synchrotron-based x-ray diffraction experiments and first-principles phonon calculations. We discovered the precursor modulations along [011] direction can be eliminated with [001] uniaxial loading, while the precursor modulations or premartensite can be totally suppressed by hydrostatic pressure condition. The TA2 phonon anomaly is sensitive to stress induced lattice strain, and the entire TA2 branch is stabilized along the directions where precursor modulations are eliminated by external stress. Our discovery bridges precursor modulations and phonon anomalies, and sheds light on the microscopic mechanism of the two-step superelasticity in precursor martensite.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); National Basic Research Program of China; Argonne National Laboratory - Advanced Photon Source
OSTI Identifier:
1242401
DOE Contract Number:
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106
Country of Publication:
United States
Language:
English

Citation Formats

Nie, Zhihua, Wang, Yandong, Shang, Shunli, Zeng, Qiaoshi, Ren, Yang, Liu, Dongmei, Yang, Wenge, Wang, Yi, and Liu, Zi-Kui. Strain-induced dimensionality crossover of precursor modulations in Ni2MnGa. United States: N. p., 2015. Web. doi:10.1063/1.4906333.
Nie, Zhihua, Wang, Yandong, Shang, Shunli, Zeng, Qiaoshi, Ren, Yang, Liu, Dongmei, Yang, Wenge, Wang, Yi, & Liu, Zi-Kui. Strain-induced dimensionality crossover of precursor modulations in Ni2MnGa. United States. doi:10.1063/1.4906333.
Nie, Zhihua, Wang, Yandong, Shang, Shunli, Zeng, Qiaoshi, Ren, Yang, Liu, Dongmei, Yang, Wenge, Wang, Yi, and Liu, Zi-Kui. Thu . "Strain-induced dimensionality crossover of precursor modulations in Ni2MnGa". United States. doi:10.1063/1.4906333.
@article{osti_1242401,
title = {Strain-induced dimensionality crossover of precursor modulations in Ni2MnGa},
author = {Nie, Zhihua and Wang, Yandong and Shang, Shunli and Zeng, Qiaoshi and Ren, Yang and Liu, Dongmei and Yang, Wenge and Wang, Yi and Liu, Zi-Kui},
abstractNote = {Precursor modulations often occur in functional materials like magnetic shape memory alloys, ferroelectrics, and superconductors. In this letter, we have revealed the underlying mechanism of the precursor modulations in ferromagnetic shape memory alloys Ni2MnGa by combining synchrotron-based x-ray diffraction experiments and first-principles phonon calculations. We discovered the precursor modulations along [011] direction can be eliminated with [001] uniaxial loading, while the precursor modulations or premartensite can be totally suppressed by hydrostatic pressure condition. The TA2 phonon anomaly is sensitive to stress induced lattice strain, and the entire TA2 branch is stabilized along the directions where precursor modulations are eliminated by external stress. Our discovery bridges precursor modulations and phonon anomalies, and sheds light on the microscopic mechanism of the two-step superelasticity in precursor martensite.},
doi = {10.1063/1.4906333},
journal = {Applied Physics Letters},
number = ,
volume = 106,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 2015},
month = {Thu Jan 01 00:00:00 EST 2015}
}